Pulation square
From HandWiki
In category theory, a branch of mathematics, a pulation square (also called a Doolittle diagram) is a diagram that is simultaneously a pullback square and a pushout square. It is a self-dual concept.
References
- Adámek, Jiří; Herrlich, Horst; Strecker, George E. (2004). Abstract and Concrete Categories (free online ed.). http://katmat.math.uni-bremen.de/acc/acc.pdf. Originally published by John Wiley & Sons; ISBN 0-471-60922-6.
- Herrlich, Horst; Strecker, George E. (1979). Category Theory. Sigma Series in Pure Mathematics. 1 (2nd ed.). Berlin: Heldermann. ISBN 3-88538-001-3.
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